Structural Safety Information and Reports

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Wrong length blind bolts lead to unsafe bridge structure

Bridge strengthening being carried out using blind bolts left a structure in an unsafe condition with traffic loading on it.

Cantilever bridge parapet falsework failure

A reporter has experienced the failure of cantilever parapet falsework twice, for different reasons, using two different products during bridge construction.

Further example of incorrect finite element modelling

Concerns in respect of the sufficiency of finite element modelling of masonry walls as part of a reinforced concrete framed building.

Corrosion concerns on a pedestrian bridge

A reporter is concerned about a pedestrian bridge that may have reduced load capacity due to corrosion at the root of cantilever supports.

Snow drift implications due to building extension

Part of a roof collapsed in a factory and warehouse facility shortly after a storm event due to snow drift loads.

Concerns over execution class categorisation of steel pedestrian bridge

A reporter is concerned in respect of the steelwork execution class, and quality management arrangements, applied to the construction of a public access pedestrian bridge.

Critical welding of structural steelwork missed

The designer of a steelwork roof frame found a critical fabrication error when inspecting steelwork on site before it was erected.

Connection fixity considerations for steel frame modelling

This report concerns the modelling of joints when using computer programs. In some cases, engineers are applying rotational releases to joints in models but subsequently designing the connections as rigid. This leaves a fundamental mismatch between analysis and design which may lead to unsafe structural connections argues a reporter.

Incorrect modelling of a cantilever

A steel framed building was incorrectly modelled and designed resulting in excessive deflection of part of the frame even before the frame was loaded with the self-weight of the building.

Excessive deflection of spliced steel beam

A long-span primary steel beam deflects excessively at its splice during concreting of the floor slab.

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Wrong length blind bolts lead to unsafe bridge structure

Cantilever bridge parapet falsework failure

Further example of incorrect finite element modelling

Corrosion concerns on a pedestrian bridge

Snow drift implications due to building extension

Concerns over execution class categorisation of steel pedestrian bridge

Critical welding of structural steelwork missed

Connection fixity considerations for steel frame modelling

Incorrect modelling of a cantilever

Excessive deflection of spliced steel beam

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